What is a constant of proportionality?

The unit rate between the two quantities is directly proportional.
The interval through which a variable changes concerning time.
The relationship between two quantities where the ratio comparing them is always constant.
The ratio between two quantities is simplified so that the denominator is one.

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c

The constant of proportionality is the ratio that relates two given values in what is known as a proportional relationship. Other names for the constant of proportionality include the constant ratio, constant rate, unit rate, constant of variation, or even the rate of change.

An example is 4/6 or 6/9